mineral

Sodalite

Na8(Al6Si6O24)Cl2

Hardness: 5.5-6.0 Mohs; Color: Royal blue to whitish-gray; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27-2.33

Hardness: 5
Color: Royal blue to whitish-gray
Luster: Vitreous to greasy

Identified February 23, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue to whitish-gray; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27-2.33

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites. It typically occurs in hydrothermal environments and pegmatites.

Uses & applications

Primary use is ornamental for jewelry, beads, and carvings. It is also used in decorative masonry and as a low-cost substitute for lapis lazuli in industry.

Geological facts

Sodalite is often mistaken for lapis lazuli, but unlike lapis, it rarely contains golden pyrite inclusions and has a lower specific gravity. It is known to fluoresce orange under UV light.

Field identification & locations

Identify by its translucent white veining and rich blue color. Commonly found in Bancroft (Ontario), Greenland, Brazil, and Namibia. Collectors should look for intense blue saturation.